The whole MBTA is shut down.  So is Amtrak from Boston to Providence.  So people waking up in the Boston area are waking up to this.  I think I heard someone say that the violence last night started in Central Square, which is very near where I lived in Cambridge.  I bought groceries every Saturday at the Purity Supreme supermarket there.  I'm not sure why an MIT police officer would respond to a robbery attempt in Central Square, so maybe I heard wrong. 

As this goes on, my visual memory is returning of these places. 

Boston Police just announced they've conducting a controlled explosion in Cambridge.  Earlier reports said that as the suspects fled Cambridge they threw bombs out of the car. 

Now it seems the guy on the run had been living in Cambridge for several years, even went to high school there.

Police still assembling, and apparently military assets assembling in the mall parking lot in Watertown.